Electric bell.



S. OLIVER.

ELEOTRIO BELL.

APPLICATION FILED 00T.9, 191s.

1,098,834, Patented June 2, 19M

SAMUEL OLIVER, OF CHICAGO, ILLINOIS.

IEIIEGTBIC BELL.

Specification of Letters Patent.

Patented June 2, 1914.

Application filedOctober 9, 1913. Serial No. 794,215.

To all whom it may concern.

Be it known that I, SAMUEL Onrvnma citizen of the United States, residing at Chicago, in the county of CookandState of Illinois, have invented certain new and useful Improvements in Electric Bells, of which the following is a specification.

This invention has reference to electric bells in general and relates more particularly to bells designed for use in alternating current circuits, such as telephone ringing circuits and door bell circuits which are equipped with suitable alternating current.

transformers.

Prior to my present invention it has always been considered necessary, so far as I am aware, to utilize a permanent magnet or make and break contacts iii-the construction of electric bells of this general character.

I have discovered, however, that by properly and accurately constructing, proportioning and positioning certain elements of the bell it is possible to eliminate the per nianent magnet and make and break contact from the construction without impairing the efiiciency or operation of the bell.

My present invention aims, therefore, to provide an electric bell which will be extremely simple in construction and cheap to manufacture, which will comprise no contact points or permanent magnet and in which, consequently the liability offailure to 0perate will be reduced to a minimum.

The invention in one of its preferred forms will be readily understood from the following description when considered in connection with the accompanyingdrawings.

Referring to the drawings, Figure 1 is a longitudinal sectional view through a bell embodying my invention; Fig. 2 is a plan iew thereof with the gong removed;

Fig. 8 is an end elevation, the gong being shown in section;

On thedrawlngsreference character 5 1ndicates the base of the bell which may be made of iron or any suitable material. To

this base I have secured by screw 6, or other fastening means, an angle bar 7, to thefree end of which is secured a pair of electromagnets 8, the cores 9 of these magnets being connected atone end by a metal bar 11 which is secured to the angle bar 7 by screws 12. The electromagnets are thereby supported directly and solely from the angle bar 7. The electromagnets may be of usual construction, wound to accommodate the current with which the bell is designed to operate, the ends of the windings being con nected with the posts 13 in the customary manner.

The iron armature 1 1 is supported by a resilient vibratory member 15 secured on the base 5 by screws 16 or otherwise, the armature being adjustably secured to the member 15 by screws 17 or other means. The resilient member 15, of definite strength accprding to the vibrations required, is so po' sltioned and proportioned that the armature 14; will be supported adjacent to the ends of the magnet cores 9 and will be permitted to vibrate toward and from the cores under the influence of current passing through the electromagnets, but will be prevented from contacting with or stickin to the ends of the cores. A hammer 18 is mounted 011 a flexible rod 19 carried by the armature. This hammer 18 is of a definite weight and the rod 19 of a definite length and resiliency to synchronize with a given current rate (usually 60 cycles per second). The rod 19 may be of circular section, as shown, but may be of other preferred cross sectional shape. A gong 21 is supported upon a standard 22 from the base 5 in position to be engaged by said hammer upon vibration of the armature. A shield or guide 23 is preferably mounted upon the base beneath the hammer 18 to protect the hammer and obviate excessive vibration thereof.

It will be manifest from the foregoing that my improved bell is designed for use in connection with alternating currents and that it' operates without the employment of any permanent magnet and that all make and break mechanisms and contact points are eliminated. The resilient vibratory member is constructed and positioned to support the armature in operative relation to the electromagnets and its resiliency causes the armature to vibrate under the influence of the alternating current acting on the electromagnets in synchronism with the fluctuations of the energizing current so that the hammer strikes the gong at each fluctuation.

While I have illustrated and described a preferred embodiment of the invention it will be obvious that considerable variation in the mechanical details disclosed may be resorted to without departing from the spirit of the invention or the scope of the following claims.

I claim: 7 1. An electric bell for alternating current circuits, comprising a base, a pair ofelectromagnets mounted thereon, a gong supported from said base, a spring mounted on said base at one end of said magnets, an armature carried by said spring adjacent the ends of said magnets, saidspring being adapted to be vibrated by said electromagnets under the influence of an alternating current but constructed to revent saidarmature from contacting with the cores of i said magnets, a flexible rod carried by and projecting at right angles from said armature, and a hammer carried by said rod in position to strike said gong, said rodand armature supporting sprmg being constructed to vibrate in synchronism with the fluctuations of the energizing current.

2'. v.An electric bell for alternating current circuits, comprising a base, an angle bar carried thereby, a palr of electromagnets supported by said angle bar parallel to said base, a spring secured to said base adjacent the unsupported ends of said magnets, an

armature adjustably mounted on said spring and normally disposed adjacent to" the ends of the armature cores but out of contact therewith, a flexible rod carried by and projecting from said armature parallel with said magnets, a hammer mounted on the free end of said rod, and ,a gong supported on said base in operative relation to said hammer, said spring and hammer supporting rod being constructed to vibrate in synchronism with the fluctuations of the energizing current. 7 a I 4 SAMUEL OLIVER. Witnesses v v I L. F. SHAFEB, CARL LUND. 

